Event: Ipswich Club Championship

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Opponent	Rating	Result
Tom Gordon	0	0 - 1
Thomas Sheat	0	0 - 1
James Stow	0	1 - 0
Conor Hickey	0	0 - 1
Kenneth Fowler	0	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-80 = (0 + 400 * (2 - 3)) / 5)